import type { EChartsOption } from 'echarts'
import type { Ref } from 'vue'
import { computed, nextTick, ref, unref, onMounted } from 'vue'
import { tryOnUnmounted, useDebounceFn, useTimeoutFn } from '@vueuse/core'
import { useEventListener } from '@/hooks/event/useEventListener'
import { useBreakpoint } from '@/hooks/event/useBreakpoint'
import echarts from '@/utils/lib/echarts'

export function useECharts(
  elRef: Ref<HTMLDivElement>,
  theme: 'light' | 'dark' | 'default' = 'default',
) {
  let chartInstance: echarts.ECharts | null = null
  let resizeFn: Fn = resize
  const cacheOptions = ref({}) as Ref<EChartsOption>
  let removeResizeFn: Fn = () => {}

  resizeFn = useDebounceFn(resize, 200)

  const getOptions = computed(() => {
    return {
      backgroundColor: 'transparent',
      ...cacheOptions.value,
    } as EChartsOption
  })

  function initCharts(t = theme) {
    const el = unref(elRef)

    console.log('el', el)

    if (!el || !unref(el)) {
      return
    }

    chartInstance = echarts.init(el, t)
    const { removeEvent } = useEventListener({
      el: window,
      name: 'resize',
      listener: resizeFn,
    })
    removeResizeFn = removeEvent

    const resizeObserver = new ResizeObserver(resizeFn)
    resizeObserver.observe(el)

    const { widthRef, screenEnum } = useBreakpoint()
    if (unref(widthRef) <= screenEnum.MD || el.offsetHeight === 0) {
      useTimeoutFn(() => {
        resizeFn()
      }, 30)
    }
  }

  onMounted(() => {
    chartInstance?.dispose()
    initCharts(theme as 'default')
    setOptions(cacheOptions.value)
  })

  // watch(
  //   () => elRef,
  //   (theme) => {
  //     if (chartInstance) {
  //       chartInstance.dispose()
  //       initCharts(theme as 'default')
  //       setOptions(cacheOptions.value)
  //     }
  //   },
  // )

  function setOptions(options: EChartsOption, clear = true) {
    cacheOptions.value = options
    return new Promise((resolve) => {
      if (unref(elRef)?.offsetHeight === 0) {
        useTimeoutFn(() => {
          setOptions(unref(getOptions))
          resolve(null)
        }, 50)
      }
      nextTick(() => {
        useTimeoutFn(() => {
          if (!chartInstance) {
            if (!chartInstance) return
          }
          clear && chartInstance?.clear()

          chartInstance?.setOption(unref(getOptions))
          resolve(null)
        }, 30)
      })
    })
  }

  function resize() {
    chartInstance?.resize({
      animation: {
        duration: 300,
        easing: 'quadraticIn',
      },
    })
  }

  tryOnUnmounted(() => {
    if (!chartInstance) return
    removeResizeFn()
    chartInstance.dispose()
    chartInstance = null
  })

  function getInstance(): echarts.ECharts | null {
    return chartInstance
  }

  return {
    setOptions,
    resize,
    echarts,
    getInstance,
  }
}
